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2014 International Conference on Applied Mechanics and Mechanical Automation(AMMA 2014)

作者： Hui-qun YANG Gui-jun LIU Ting WANG Brilliance China Automotive Holdings Co. Ltd.

To efficiently construct the topology of STL file is one of the key factors to improve efficiency of slicing algorithm. In this paper a topology construction algorithm based on triangle facets ring and a rapid slicing algorithm are developed, in which the flag variables are defined to reduce search range when slicing. Then the algorithm can reduce the times of traversing and sorting for the triangle facets and the times of calculation intersection in the slicing processes, and it also can simplify the process of constructing the slice contour so as to improve the efficiency of the slicing algorithm.

关键词： STL file Rapid prototyping Triangle facets ring slicing algorithm

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Facet Normal Vector Based Adaptive slicing algorithm

Facet Normal Vector Based Adaptive Slicing Algorithm

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2010 2nd International Conference on Computer Engineering and Technology(2010年第二届计算机工程与技术国际会议 ICCET 2010)

作者： Huabing Wang Hongyou Bian Weijun Liu Mechanical School Huaihai Institute of Technology Lianyungang Jiangsu ProvinceRP China Advanced Equipment Research Laboratory Shenyang Institute of Automation Chinese Academy of Sciences

ISBN: (纸本)9781424463473

Layer milling with uniform layer thickness is one of the main approaches for complex surfaces roughing and semi-finishing. But uneven thick material is left near the horizontal plane in some milling experiments. And the existed slicing methods can not properly solve this problem. A new slicing algorithm based on triangular facet normal vector and facet group area threshold is given. In the new algorithm,the facet normal vector is used to locate the candidate facets near which the possible uncut regions lie. Then the candidate facets are grouped with their height values and each group area is compared with a threshold. The larger is chosen as the interested groups and their height values are recorded. At last the slicing positions are determined with the height records and the given layer thickness and computation is committed. Experiments show that the new algorithm can solve the previous problem.

关键词： slicing algorithm Triangular facet Normal vector

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Planar and nonplanar slicing algorithms for fused deposition modeling technology: a critical review

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2022年第5-6期119卷 2785-2810页

作者： Nayyeri, Pooyan Zareinia, Kourosh Bougherara, Habiba Ryerson Univ Fac Engn & Architectural Sci Dept Mech Engn 350 Victoria St Toronto ON M5B 2K3 Canada

Fused deposition modeling (FDM) is one of the most popular and ubiquitous additive manufacturing methods, which uses a layering procedure to build 3D models layers-upon-layers. Since the layers are the constituents of the resulted 3D part, the layering process can directly affect the part's surface finish and mechanical properties, which are the two major drawbacks in FDM. To this end, investigating different layering/slicing algorithms can deepen the understanding of the challenges and gaps in FDM, which will help improve the quality of the 3D printed parts. In this review, slicing algorithms developed for FDM technology are categorized into two main groups: planar and nonplanar. While planar algorithms generate flat layers, nonplanar algorithms provide curved and out-of-plane layers, increasing build speed, eliminating support structures, smoothening the outer surface, and enhancing mechanical properties. Planar algorithms are subdivided into single-axis and multi-axis algorithms. Single-axis printing confines the build direction along the perpendicular axis of the build platform, while multi-axis printing can change the build direction for different layers. Conventional Cartesian printers can achieve single-axis planar printing and are the dominant approach in commercial FDM printers. Upgraded hardware and complicated calculations are needed to enable the printer to deploy multi-axis planar and nonplanar printing capability, which are the downsides of these advanced methods. This review broadly discusses the impact of the slicing algorithm on the surface quality, build time, support structure, and mechanical properties of 3D printed parts. Current challenges and prospective solutions are presented.

关键词： slicing algorithm Layering process Fused deposition modeling Classification Planar slicing Nonplanar slicing

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Improved algorithm for static slicing of concurrent programs

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Jisuanji Gongcheng/Computer Engineering 2006年第14期32卷 14-16+45页

作者： Xiao, Jian-Yu Zhang, De-Yun Chen, Hai-Quan Dong, Hao School of Electronics and Information Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Computer Science Shaoyang University Shaoyang 422000 China

This paper proposes a algorithm for static slicing of concurrent programs. Based on the analysis of the fact that Krinke's slicing algorithm produces imprecise program slice for the program structure which has loops embedded with one or more threads, a conclusion is drawn that the reason for the impreciseness is that Krinke's data structure which threads program dependence graph and has over coarse definitions of data dependence relations between threads, The constraint puts on the execution path in concurrent program is too loose. An improved algorithm is proposed which added a new kind of data dependence relation between threads-loop carries data dependence crossing thread boundaries and introduces a new concept of region execution witness to further constrain the execution path. Examples show that the improved slicing algorithm could restrain the impreciseness of Krinke's.

关键词： Concurrent programs Execution witness Program dependence graph slicing algorithm Static slicing of programs

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Research on an algorithm for File slicing Processing in 3D Printing

Research on an Algorithm for File Slicing Processing in 3D P...

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2013 International Conference on Electrical,Control and Automation Engineering(ECAE 2013)

作者： Meng YANG Peng CAO School of Information Engineering Beijing Institute of Graphic Communication

A new algorithm is presented to solve the problems of time consuming and take up the large storage space for file slicing in 3D printing process. The algorithm use the topological structure information and the continuity of the triangular facets by analyzing the process of the layered and the relationship among unit triangles of sliced files(STL file). This algorithm not only saved time and memory space of the layered process effectively, but also improved the reliability of the layered profile information.

关键词： slicing algorithm 3D printing STereo Lithography(STL) file

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A slicing and path generation method for 3D printing of periodic surface structure

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JOURNAL OF MANUFACTURING PROCESSES 2024年 120卷 694-702页

作者： Dong, Bin Wang, Yan Lu, Yanglong Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Clear Water Bay Hong Kong Peoples R China Georgia Inst Technol Woodruff Sch Mech Engn Atlanta GA USA

Periodic surface (PS) model holds enormous potential in the field of lightweight, heat management, and biomedical implants. To achieve tunable mechanical strength and high surface area versus volume (SA/V) ratio, it is imperative to achieve solid representation of the PS models. However, because of the complex inner structure, converting the surface model to solid model with uniform thickness remains a major challenge. In the meantime, the most pervasive practice to achieve tunable wall thickness is by offsetting the contour with a constant value or setting a constant value difference between two implicit functions. However, these existing approaches cannot guarantee uniform wall thickness. In this paper, a novel method is proposed to define an adjacent implicit surface with a uniform offset distance to the original. By repeatedly generating implicit surfaces with uniform distance from each other, the solid representation of the PS model with uniform thickness can be achieved. Meanwhile, a new slicing method allowing for the slicing without stereolithography (STL) file is developed to slice the implicit surfaces and generate the printing path so that the accumulation of slicing errors introduced by meshing steps can be avoided. By slicing each implicit surface separately, the corresponding Gcode file is generated. This developed method is demonstrated by fabricating typical PS with fused filament 3D printing.

关键词： Triply periodic minimum surface Periodic surface modeling Additive manufacturing Tool path generation slicing algorithm

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Parting line formation by slicing a 3D CAD model

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ENGINEERING WITH COMPUTERS 1998年第4期14卷 330-343页

作者： Wong, T Tan, ST Sze, WS Univ Hong Kong Dept Mech Engn Hong Kong Hong Kong

An effective computer-aided parting line/surface formation algorithm can increase the overall efficiency in the mould design and manufacturing processes. The presence of free-form surfaces in a product model imposes a burden on mould makers to determine the parting line and parting surfaces. Previously proposed algorithms, although available, are few, and mainly deal with products with planar or simple curved surfaces. A new algorithm, which adopts an uneven slicing on the product model, is proposed. The algorithm provides a quick and effective way to locate the parting line and parting surface of a free-form product model.

关键词： parting line slicing algorithm undercut detection

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Type slicing: An accurate object oriented slicing based on sub-statement level dependence graph

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INFORMATION AND SOFTWARE TECHNOLOGY 2020年 127卷 106369-106369页

作者： Wang Lulu Li Bixin Kong Xianglong Southeast Univ Sch Comp Sci & Engn Nanjing Peoples R China

Context: Program slicing is very useful in program analysis and software engineering. It computes the slice, which is a part of program and contains all the statements related to the given slicing criterion. The more accurate a slicing technique could be, the smaller the slice is. Objective: This paper aims to improve the current slicing accuracy for object-oriented programs. The slicing accuracy is mainly related to three factors, the dependency graph (which extracts the inner relationships of source code), the slicing criterion (which determines the slicing requirement), and the slicing algorithm (which computes the slice for the criterion from the dependency graph). Method: Our method consists of three parts. First, we present a Sub-Statement Level Dependence Graph (SSLDG), which computes finer-grained dependences for object-oriented programs than mostly-used statement level graph. Second, we present a new type slicing criterion called (Sub-statement) Type slicing Criterion (STSC), which supports the user to specify not only the statement and object variable, but also the type of object among its polymorphic types. At last, a corresponding slicing algorithm called (Sub-statement) Type slicing (STS) is designed to perform the slicing process. Results: We implement STS on Java programs as MyJavaSlicer, and run it with ten open source projects and random slicing criteria. The results show that STS slicing algorithm as well as SSLDG would make slices 35.90% smaller than traditional two-phase slicing;additionally using STSC would make the slices 48.4% further smaller;STSC also helps traditional two-phase slices reduced by 56.90%. Conclusions: STS could provide more accurate slices than traditional two-phase slicing, and it also runs faster on most cases;STSC helps specify the slicing requirement, and roughly halves the size of slices for both slicing algorithms.

关键词： Program slicing System dependence graph Object-oriented program slicing algorithm

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AltPrint: new filling and slicing process planning based on deposited material with geometry variation

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RAPID PROTOTYPING JOURNAL 2023年第8期29卷 1702-1714页

作者： Idogava, Henrique Takashi do Couto, Daniel Marcos Souza Santana, Leonardo Alves, Jorge Lino Silveira, Zilda Castro USP EESC Dept Mech Engn Sao Carlos Brazil USP EESC Dept Elect & Comp Engn Sao Carlos Brazil USP EESC Dept Mech Engn Sao Carlos Brazil Univ Porto Fac Engn Dept Mech Engn Porto Portugal Univ Sao Paulo Dept Mech Engn Sao Paulo Brazil

PurposeThis paper aims to address the development and implementation of "AltPrint," a slicing algorithm based on a new filling process planning from a variation in the deposited material geometry. AltPrint enables changes in the extruded material flow toward local variations in stiffness. The technical feasibility evaluation was conducted experimentally by fused filament fabrication (FFF) process of snap-fit subjected to a mechanical cyclical test. Design/methodology/approachThe methodology is based on the estimation of the parameter E from the mathematical relationships among the variation of the material in the material flow, nozzle geometry and extrusion parameters. Calibration, validation and analysis of the printed specimens were divided into two moments, of which the first refers to the material responses (flexural and dynamic mechanical analysis) and the second involves the analysis of the printed components with localized flow properties (for estimating the response to cyclic loading). Finite element analysis assisted in the comparison of two snap-fit geometries, one traditional and one generated by AltPrint. Finally, three examples of compliant mechanisms were developed to demonstrate the potential of the algorithm in the generation of functional prototypes. FindingsThe contribution of AltPrint is the variable fill width integrated with the slicing software that varies the print parameters in different regions of the object. The alternative extrusion method based on material rate variation was conceived as an "open software" available in GitHub platform, hence, open manufacturing with initial focus on desktop 3D printer based on FFF. The slicing method provides deposited variable-width segments in an organized and replicable filling strategy, resulting in mechanical properties variations in specific regions of a part. It was implemented and evaluated experimentally and indicated potential applications in parts manufactured by the additive process based on e

关键词： Additive planning slicing algorithm Complaint mechanisms Fused filament fabrication Design for additive manufacturing Snap-fit Functional parts

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Radial slicing for helical-shaped advanced manufacturing applications

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2021年第3-4期112卷 1089-1100页

作者： Munasinghe, Nuwan Paul, Gavin Univ Technol Sydney Ctr Autonomous Syst Ultimo Australia

The fourth industrial revolution (Industry 4.0) is transforming industries all around the world focusing on areas including advanced robotics and automation, sensor technology and data analytics. The authors are involved in a project developing a multi-robot material extrusion 3D printer to print a gravity separation spiral (GSS), an instrument used in the mining industry to separate mineral slurry into different density components. Compared with traditional mould-based manufacturing, this new additive manufacturing method will significantly reduce manufacturing tooling costs, improve the customisation to enable the production of bespoke GSS that each processes different minerals and reduce worker exposure to hazardous materials. slicing and printing large-scale helical objects in conventional horizontal layer addition would result in an unreasonable amount of waste material from support structures, and poor surface quality due to step-wise bumps. This paper presents a novel slicing algorithm using concentric vertical ray lines to slice objects radially, enabling layers to be deposited progressively in the same fashion. This method can be applied in large-scale additive manufacturing where objects are printed by a robot in a radial direction, which is different from layered vertical printing in conventional additive systems. An example GSS is sliced to generate motion plans for a print head affixed to the end effector of a robot arm. Then through simulations, it is shown how a robot's expected manipulability measure can be used to predict and ensure the successful completion of the print.

关键词： Advanced manufacturing Additive manufacturing 3D printing slicing algorithm Manipulability

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